CN114702262B - Impervious self-repairing concrete additive, self-repairing agent and preparation method thereof - Google Patents
Impervious self-repairing concrete additive, self-repairing agent and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 39
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000654 additive Substances 0.000 title claims abstract description 9
- 230000000996 additive effect Effects 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000004568 cement Substances 0.000 claims abstract description 46
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 45
- 229920000642 polymer Polymers 0.000 claims abstract description 30
- 238000004132 cross linking Methods 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 14
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 159000000003 magnesium salts Chemical class 0.000 claims abstract description 10
- 239000003999 initiator Substances 0.000 claims abstract description 6
- 239000008367 deionised water Substances 0.000 claims abstract description 5
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 5
- 239000004576 sand Substances 0.000 claims description 12
- 239000004575 stone Substances 0.000 claims description 12
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 claims description 7
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- 230000007547 defect Effects 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 5
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 5
- 230000003487 anti-permeability effect Effects 0.000 claims description 5
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 4
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 4
- 229920005646 polycarboxylate Polymers 0.000 claims description 4
- 159000000000 sodium salts Chemical class 0.000 claims description 4
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical compound O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 claims description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 3
- 229920001732 Lignosulfonate Polymers 0.000 claims description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 3
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- ATVJXMYDOSMEPO-UHFFFAOYSA-N 3-prop-2-enoxyprop-1-ene Chemical compound C=CCOCC=C ATVJXMYDOSMEPO-UHFFFAOYSA-N 0.000 claims description 2
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000000498 cooling water Substances 0.000 claims description 2
- 229920006037 cross link polymer Polymers 0.000 claims description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000178 monomer Substances 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000006386 neutralization reaction Methods 0.000 claims description 2
- 229920000233 poly(alkylene oxides) Polymers 0.000 claims description 2
- 229920000058 polyacrylate Polymers 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 239000012266 salt solution Substances 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims description 2
- 239000007858 starting material Substances 0.000 claims description 2
- 239000011358 absorbing material Substances 0.000 abstract description 7
- 230000036571 hydration Effects 0.000 abstract description 5
- 238000006703 hydration reaction Methods 0.000 abstract description 5
- 238000007711 solidification Methods 0.000 abstract description 3
- 230000008023 solidification Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 26
- 239000007787 solid Substances 0.000 description 10
- 238000006116 polymerization reaction Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 239000003973 paint Substances 0.000 description 6
- 239000010426 asphalt Substances 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 5
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000013522 chelant Substances 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 229940091250 magnesium supplement Drugs 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- NEMFQSKAPLGFIP-UHFFFAOYSA-N magnesiosodium Chemical compound [Na].[Mg] NEMFQSKAPLGFIP-UHFFFAOYSA-N 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- -1 aluminum ions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002308 calcification Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PYGSKMBEVAICCR-UHFFFAOYSA-N hexa-1,5-diene Chemical group C=CCCC=C PYGSKMBEVAICCR-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses an anti-seepage self-repairing concrete additive, a self-repairing agent and a preparation method thereof, wherein the additive is implemented according to the grading of C25, and comprises the following components in percentage by weight: 6-12% of self-repairing agent (cement); 0.03% -0.1% of curing initiator (based on cement); 1% of water reducer (according to the water consumption); the self-repairing agent comprises the following components in percentage by weight: 10-17% of polymer liquid; 7-10% of sodium hydroxide; 0.7-1% of cross-linking agent; 0.3-0.5% of crosslinking accelerator; 10-18% of water-soluble magnesium salt; 45-70% of deionized water. The invention also provides a preparation method of the self-repairing agent. The invention solves the contradiction that the water-absorbing polymer swells to destroy the solidification of cement, and enables the expansion and hydration of the water-absorbing material to be carried out simultaneously, so that the impervious strength of the test piece is improved by several times to a very high degree (more than or equal to P12), the use requirement of engineering water prevention is met, and the self-repairing effect is achieved.
Description
Technical Field
The invention belongs to the technical field of special impervious concrete, and particularly relates to an impervious self-repairing concrete additive, a self-repairing agent and a preparation method thereof.
Background
The existing waterproof material mainly comprises waterproof coiled materials and waterproof paint. The waterproof coiled material mainly comprises a modified asphalt coiled material, a self-adhesive asphalt waterproof coiled material and a high polymer coiled material.
The modified asphalt coiled material is like SBS and APP coiled materials which are popular in the current waterproof material market, the flame spray gun is required to carry out on-site surface hot melting, open fire is required, the technical requirement is high, and the surface hot melt adhesive is easy to coke. The width of the coiled material is only one meter, and the coiled material is much lapped when being paved, and the coiled material needs to be cut according to the shape requirement of the base layer, so that the lapped quantity is larger, and the hidden danger of seam water resistance is easily caused; the self-adhesive asphalt waterproof coiled material has the problems of weak adhesive force and easy falling.
The adhesion of the polymer coiled material and the base layer adopts a neoprene adhesive, which has poor water resistance and is easy to cause waterproof failure due to degumming, so the adhesion of the polymer coiled material becomes a key of waterproof quality.
The waterproof paint is waterproof excellent material, asphalt waterproof paint and polymer waterproof paint. The present macromolecule waterproof paint has better performance and can be made into color, thus the color of the roof is more abundant. The polymer coating adopted at present adopts water emulsion coating based on water emulsion, which adopts cold construction, but the solid content is low and generally not more than (60-70%), the coating thickness in each pass is limited by curing conditions, the coating cannot be quite thick, the film forming needs multiple passes of coating, and the water of the emulsion cannot volatilize under humid conditions, so that the emulsion cannot be cured, and the coating is very inconvenient. The thickness of the waterproof paint is required to be painted for many times to meet the waterproof technical specification, so that the efficacy is greatly influenced, and the application range is limited.
The problems and technical defects of the material performance limit the improvement and perfection of the waterproof engineering quality, and a complete scheme is required to be provided to solve the problems.
However, the above materials are difficult to improve the body only by surface protection of the construction mortar and structure. Because the aging time of the organic material is short, the organic material is difficult to have the same service life as inorganic materials such as mortar. In addition, the construction conditions are also limited to a certain extent, and are influenced by factors such as the appearance of a building structure, the environment and the like, so that the construction is difficult under a plurality of conditions.
The concrete body is improved, the waterproof and defect repairing capacity of the concrete body is improved, and the concrete body is one of very important means for improving the waterproof and anti-seepage performances of a building. At present, polymer emulsion and rubber powder are adopted to be mixed into mortar to improve the compactness and the water resistance. But the cement has no ability to solve the problems of construction and proportioning and the defect loosening and leakage occurring in the later period of cement solidification.
In engineering practice, in the casting of concrete. The concrete can be waterproof and invalid due to the influences of slump, construction method, maintenance condition and the like and some technological errors. Some water leakage conditions are very complex, and the existing engineering maintenance technology is difficult to operate or has very high maintenance cost.
Disclosure of Invention
In view of the above problems, a first object of the present invention is to provide an anti-seepage self-repairing concrete admixture for an underground concrete structure, which solves the problems of construction reasons such as concrete slump, improper maintenance, etc., and leakage phenomena caused by loosening and micro cracks due to uncompacted pouring and compaction due to the change of the concrete structure.
In order to achieve the first object, the present invention adopts the following technical scheme:
the impervious self-repairing concrete additive is prepared from cement, sand and stone as main components according to the grading of C25: water: 175kg cement: 398kg sand: 566kg of stones: 1261kg (mixing ratio: 0.44:1:1.42:3.17).
The composite material comprises the following components in percentage by weight:
6-12% of self-repairing agent (based on the weight of cement);
0.03% -0.1% of curing initiator (based on the weight of cement);
the water reducer (which is prepared according to the water consumption) is 1 percent.
Preferably, the composition comprises the following components in percentage by weight:
6-10% of self-repairing agent (based on the weight of cement);
0.05% -0.1% of curing initiator (based on the weight of cement);
the water reducer (which is prepared according to the water consumption) is 1 percent.
Further, the self-repairing agent is one or a mixture of more than one of polyamide and polyacrylate high-low crosslinked polymer; the curing starter is one of ammonium persulfate and sodium persulfate; the water reducer is one of lignosulfonate, melamine water reducer and powdery polycarboxylate.
After the admixture is added into concrete, after the concrete is solidified, the seepage resistance can be greatly improved after the concrete is self-maintained in water or in a wet state for a period of time due to loose or insufficient seepage resistance strength, and the functions of self-repairing defects and recovering seepage resistance and plugging are achieved. The anti-seepage strength can be improved in an anti-normal state. If the water pressure is increased and then the leakage is broken down, the anti-seepage strength can be improved again. Restoring the impervious capacity and repairing the broken down parts after multiple times. It has obvious repairing effect on the anti-seepage structure. The mortar impervious strength of P6 with very low initial impervious strength of the test piece can be improved by several times to a very high degree (more than or equal to P12), so that the requirement of engineering waterproof use can be met.
The invention also aims to provide the proportion and the preparation method of the concrete self-repairing agent. The anti-permeability self-repairing concrete self-repairing agent comprises the following components in percentage by weight:
10-17% of polymer liquid; 7-10% of sodium hydroxide; 0.7-1% of cross-linking agent;
0.3-0.5% of crosslinking accelerator; 10-18% of water-soluble magnesium salt; 45-70% of deionized water.
Preferably, the composition comprises the following components in percentage by weight:
11-17% of polymer liquid; 8-10% of sodium hydroxide; 0.7-0.9% of cross-linking agent;
0.3-0.5% of crosslinking accelerator; 10-16% of water-soluble magnesium salt; 45-55% of deionized water.
Further, the polymer liquid is one of an acrylic monomer and acrylamide.
Further, the cross-linking agent is one of polyethylene glycol diallyl, polyethylene oxide dialkyi glycol and N, N-methylene bisacrylamide.
Further, the crosslinking accelerator is one of triethanolamine and polyethylene glycol.
Further, the water-soluble magnesium salt is one of magnesium chloride hydrate and magnesium sulfate.
The invention also provides a preparation process method of the self-repairing agent, which comprises the following steps:
slowly dropwise adding sodium hydroxide solution into polymer liquid under ice bath or cooling water to neutralize, so as to obtain neutral sodium salt solution, and controlling the neutralization temperature to be lower than 40 ℃; and adding a crosslinking agent and a crosslinking accelerator, slowly adding a water-soluble magnesium salt, and uniformly stirring to form white or transparent liquid, thus obtaining the self-repairing agent liquid with low crosslinking.
The sodium salt of a polymer is a water-absorbing material, but is soft after absorption of water. Is easy to break under strong stirring. However, the strength is increased by calcification in cement, and the calcium and magnesium complex chelate is formed on the surface after adding water-soluble magnesium salt although the calcium and magnesium complex is increased rapidly and loose. The density and the internal strength are higher. Meanwhile, the strength of the water-absorbing polymer sodium-magnesium salt liquid after crosslinking is greatly higher than that of the water-absorbing polymer sodium salt. The strength of the concrete is not affected.
The invention has the advantages that the process of crosslinking the water-absorbing polymer sodium-magnesium salt liquid and the hydration process of cement are simultaneously combined, and the water-absorbing polymer is chelated on the surface under the condition of rich calcium ions and aluminum ions. Forming a comprehensive chelate of calcium and magnesium. Meanwhile, a certain amount of water is increased in the later stage of cement hydration, and the curing degree of mortar is increased. This chelation is limited to water-absorbing polymer surfaces. An egg-shaped material is formed, which is very hard on the surface and soft on the inside. When the defect of the concrete structure is broken down by water, the polymer has low strength and can break down only by the surface strength, and the internal material can absorb water to expand to block the water channel. And promote hydration crystallization of the unhydrated cement. At the same time, the surface is re-chelated, forming more crust and stopping expansion. If the water pressure rises again, the shell breaks again, again creating more shell. Greatly improves the impermeability of the concrete
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the water-absorbing polymer is added into the cement material, and can absorb water and expand immediately after meeting water, so that the viscosity is increased, the workability is greatly influenced, the water-absorbing polymer can shrink after losing water, and a plurality of cracks can be generated by the water-absorbing polymer, so that the water-absorbing polymer is difficult to use. The method solves the contradiction that the water-absorbing polymer swells to damage the cement solidification, and can simultaneously perform chain extension, crosslinking and hydration of the water-absorbing material;
2. the free calcium ions of cement are utilized to chelate the water absorbing material in a short time, so that the water absorbing material temporarily loses expansibility, and when the hydraulic pressure force breaks down the polymer balance system, the water channel is immediately expanded and blocked. Achieving the self-repairing performance;
3. the self-repairing concept is rigid and soft, can be used in dry and wet alternate environments, and can still function under the condition of repeated cracking;
4. the water absorption rate and the curing time of the water absorbing material can be controlled, and the application range is wider. Since the water absorption of the water absorbing material is determined by the degree of crosslinking at the time of its production, that is, the proportion of the crosslinking agent and the amount of the crosslinking accelerator. The proportion and the absolute value dosage are adjusted. The required water absorption and strength can be obtained. This prevents too high a degree of crosslinking and makes it difficult to expand with water. Affecting repair capability. But also prevents the water absorption from being reduced when the crosslinking degree is too low. The strength of the concrete is lowered due to excessive water absorption. The curing time is controlled by the amount of ammonium persulfate and sodium persulfate as the curing initiator. The amount of the curing agent can control the increase speed of the polymer molecular weight of the curing agent to be matched with the curing speed of the cement material, so that the curing agent becomes solid after the cement is cured, the bonding rate is improved, the curing strength of the cement is prevented from being influenced by too slow speed, and the curing agent and the cement are separated from each other too fast speed.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The self-repairing agent comprises the following components in parts by weight:
sodium hydroxide is dissolved in water, acrylic acid and sodium hydroxide are neutralized according to a molar ratio of 1:1, a specified PH value is obtained, the whole-process temperature is not more than 40 ℃, and the polymerization reaction temperature is too high, so that self polymerization is easy to cause. And adding a crosslinking agent N, N-methylene bisacrylamide and a crosslinking accelerator triethanolamine, slowly adding magnesium chloride hexahydrate, and obtaining the self-repairing agent liquid after the magnesium chloride hexahydrate is completely dissolved.
The concrete material is made of cement, sand and stone as main bodies, and is implemented according to the grading of C25: water: 175kg cement: 398kg sand: 566kg of stones: 1261kg (mixing ratio: 0.44:1:1.42:3.17) of solid sodium persulfate (based on the weight of cement) was added in an amount of 0.07% to prepare a ready-mixed product. 7% of self-repairing agent (based on the weight of cement) and water are mixed and added for stirring, and 1% of powder polycarboxylate water reducer (based on the water consumption required by slump) is subjected to solid compounding.
Performance test:
the minimum P12 standard is reached.
Example 2
The self-repairing agent comprises the following components in parts by weight:
sodium hydroxide is dissolved in water, acrylic acid and sodium hydroxide are neutralized according to a molar ratio of 1:1, a specified PH value is obtained, the whole-process temperature is not more than 40 ℃, and the polymerization reaction temperature is too high, so that self polymerization is easy to cause. And adding a crosslinking agent N, N-methylene bisacrylamide and a crosslinking accelerator triethanolamine, slowly adding magnesium chloride hexahydrate, and completely dissolving. Thus obtaining the self-repairing agent liquid.
The concrete material is made of cement, sand and stone as main bodies, and is implemented according to the grading of C25: water: 175kg cement: 398kg sand: 566kg of stones: 1261kg (mixing ratio: 0.44:1:1.42:3.17) of solid sodium persulfate (based on the weight of cement) was added in an amount of 0.07% to prepare a ready-mixed product. 7% of self-repairing agent (based on the weight of cement) and water are mixed and added for stirring, and 1% of powder polycarboxylate water reducer (based on the water consumption required by slump) is subjected to solid compounding.
Performance test:
the minimum P15 standard is reached.
Example 3
The self-repairing agent comprises the following components in parts by weight:
sodium hydroxide is dissolved in water, acrylic acid and sodium hydroxide are neutralized according to a molar ratio of 1:1, a specified PH value is obtained, the whole-process temperature is not more than 40 ℃, and the polymerization reaction temperature is too high, so that self polymerization is easy to cause. Adding cross-linking agent polyethylene glycol diallyl ether and cross-linking accelerator triethanolamine, slowly adding magnesium sulfate, and completely dissolving. Thus obtaining the self-repairing agent liquid.
The concrete material is made of cement, sand and stone as main bodies, and is implemented according to the grading of C25: water: 175kg cement: 398kg sand: 566kg of stones: 1261kg (mixing ratio: 0.44:1:1.42:3.17) of solid ammonium persulfate (based on the weight of cement) was added in an amount of 0.05% to prepare a ready-mixed solution. 7% of self-repairing agent (based on the weight of cement) and water are mixed and added for stirring, and 1% of melamine water reducer (based on the water consumption required by slump) is subjected to solid compounding.
Performance test:
the minimum reaches the P12 standard.
Example 4
The self-repairing agent comprises the following components in parts by weight:
sodium hydroxide is dissolved in water, acrylamide and sodium hydroxide are neutralized according to a molar ratio of 1:1, a specified PH value is obtained, the whole-process temperature is not more than 40 ℃, and the polymerization reaction temperature is too high, so that self polymerization is easy to cause. And adding a crosslinking agent of polyalkylene oxide and a crosslinking accelerator of polyethylene glycol, and slowly adding magnesium chloride hexahydrate until the magnesium chloride hexahydrate is completely dissolved. Thus obtaining the self-repairing agent liquid.
The concrete material is made of cement, sand and stone as main bodies, and is implemented according to the grading of C25: water: 175kg cement: 398kg sand: 566kg of stones: 1261kg (mixing ratio: 0.44:1:1.42:3.17) of solid ammonium persulfate (based on the weight of cement) was added as a basis and premixed. 10% of self-repairing agent (based on the weight of cement) is mixed with water, stirred, and the lignin sulfonate water reducer 1% (based on the water consumption required by slump) is subjected to solid compounding.
Performance test:
the minimum P12 standard is reached.
Claims (7)
1. The anti-permeability self-repairing agent for the self-repairing concrete is characterized by comprising the following components in percentage by weight:
10-17% of polymer liquid; 7-10% of sodium hydroxide; 0.7-1% of cross-linking agent;
0.3-0.5% of crosslinking accelerator; 10-18% of water-soluble magnesium salt; 45-70% of deionized water;
the preparation method of the self-repairing agent adopts the following process:
slowly dropwise adding sodium hydroxide solution into polymer liquid under ice bath or cooling water to neutralize, so as to obtain neutral sodium salt solution, and controlling the neutralization temperature to be lower than 40 ℃; adding a crosslinking agent and a crosslinking accelerator, slowly adding a water-soluble magnesium salt, and uniformly stirring to form white or transparent liquid, thus obtaining low-crosslinking self-repairing agent liquid;
the polymer liquid is one of an acrylic acid monomer and acrylamide;
the water-soluble magnesium salt is one of magnesium chloride hydrate and magnesium sulfate.
2. The self-repairing agent for anti-permeability self-repairing concrete according to claim 1, which is characterized by comprising the following components in percentage by weight:
11-17% of polymer liquid; 8-10% of sodium hydroxide; 0.7-0.9% of cross-linking agent;
0.3-0.5% of crosslinking accelerator; 10-16% of water-soluble magnesium salt; 45-55% of deionized water.
3. The self-repairing agent for anti-permeability self-repairing concrete according to claim 1, wherein the cross-linking agent is one of polyethylene glycol diallyl ether, polyalkylene oxide glycol and N, N-methylene bisacrylamide.
4. The self-repairing agent for anti-permeability self-repairing concrete according to claim 1, wherein the crosslinking accelerator is one of triethanolamine and polyethylene glycol.
5. The impervious self-repairing concrete additive is prepared from cement, sand and stone as main components according to the grading of C25: 175kg of water; 398kg of cement; 566kg of sand; the mixing ratio of 1261kg of stones is as follows: 0.44:1:1.42:3.17, which is characterized in that the additive consists of the following components in percentage by weight:
the self-repairing concrete for impermeability according to any one of claims 1 to 4: 6-12% of cement;
curing initiator: 0.03 to 0.1 percent of cement based on the weight of the cement;
water reducing agent: performing actual preparation according to the water consumption by 1%;
after the admixture is added into concrete, after the concrete is solidified and leakage occurs, the admixture can be self-maintained in water or in a wet state for a period of time, so that the anti-seepage capability can be greatly improved, the self-repairing defect can be achieved, and the anti-seepage and leakage-stopping functions can be recovered; the impervious strength can be improved in an inverse normal state; after the water pressure is increased and then the leakage is broken down, the anti-seepage strength can be improved again, the anti-seepage capability is recovered, and the anti-seepage device has the capability of repairing after being broken down for many times.
6. The anti-seepage self-repairing concrete admixture according to claim 5, wherein the admixture comprises the following components in percentage by weight:
the self-repairing concrete for impermeability according to any one of claims 1 to 4: 6-10% of cement;
curing initiator: 0.05 to 0.1 percent of cement based on the weight of the cement;
water reducing agent: the actual preparation is 1% according to the water consumption.
7. The anti-seepage self-repairing concrete additive according to claim 5 or 6, wherein the self-repairing agent is one or a mixture of more of polyamide and polyacrylate high-low crosslinked polymers; the curing starter is one of ammonium persulfate and sodium persulfate; the water reducer is one of lignosulfonate, melamine water reducer and powdery polycarboxylate.
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Denomination of invention: Impermeable self repairing concrete admixture, self repairing agent and their preparation method Granted publication date: 20230512 Pledgee: Zhejiang Deqing Rural Commercial Bank Co.,Ltd. Xinshi sub branch Pledgor: Zhejiang Luban building materials Polytron Technologies Inc. Registration number: Y2024980033909 |
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